Pasteurizing system



March 25, 19 J. a. PASTEURIZING 3Y$TEM ATTORNEY.

mshw Y mwmwmm B E Filed April 4, 1mm

ma. QMWWQENSSQ Pecan Mai-.25, 1941 2,236,087

UNITED'STATES PATENT OFFICE 2,236,087 PASTEUBIZING SYSTEM Joseph B. Detwiler, Rochester, N. Y., assignor to Taylor Instrument Companies, Rochester, N. Y., a corporation oi New York Application April 4. 1940, Serial No. 327,847

4 Claims. (01. ass-1a) This invention relates to pasteurizing systems. struction of the flow diversion valve 5, except In certain types of pasteurizers, notably in flash to state that its inlet 8 is connected by pipe 1' pasteurizers it is the practice to incorporate in to the discharge end of a pasteurizer unit 8, the system a flow diversion valve by which propwhile the port 3 01' this valve is connected by the erly pasteurized milk or the like is discharged pipe III to the supply tank ll of the pasteurizer 5 to the regenerator but improperly pasteurized unit or to the milk passage leading to this unit milk is diverted or returned to the, pasteurizer so that the diverted milk may be returned for unit for further treatment. In the normal operfurther pasteurization. The outlet port l2 of ation of such pasteurizing systems, the milk this valve may be connected by the pipe it to must be raised to a temperature 01' 160 F. bethe regenerator unit M. This valve 5 is 01 the l tore it will be discharged by the valve. Howpneumatically operated type including a motor ever, when it becomes necessary to clean such top II to which compressed air is supplied under a pasteurizing system and the regenerator inthe control 01' suitable control mechanism to open cluded therein, it is desirable to circulate through against the action of a spring (not shown) which the entire system, a cleaning liquid at a temnormally tends to close the valve. The frame perature much lower than the pasteurizing temof the valve 3 has mounted thereon a switch I perature, for example, below 120 I". In the norwhich maintains its movable blade It in engagemal operation of this type of pasteurizing system ment with its left hand contact except when the as previously known, the flow diversion valve switch button I! engages the coupling clip I8 would move to its ilow diverting position when (the condition illustrated). 20 such lower temperature liquid flowed from the The control mechanism for selectively posipasteurizer whereby the cleaning fluid would be tioning the flow diversion valve includes a bulb diverted back to the pasteurizer unit and none 20 of a thermosensitive tube system which bulb of this cleaning liquid would flow through the is exposed to the milk flowing from the pasteuroutlet 01' the flow diversion valve to the remainder izer unit 8 into the inlet port 6 01' the iiow diver- 25 oi. the system including the regenerator. sion valve. This tube system in addition to the In accordance with the present invention there bulb 20 includes a capillary tube 2| connecting is provided a pasteurizing system having a new the bulb with two Bourdon springs 22 and 23. diversion valve therein, the system being so ar- The tube system is filled with any suitable therranged that when it is adjusted to a certain low mosensitive medium such as mercury or a vatemperature range, the valve will not divert the p rizable liq i nd i s v h free and 0f cleaning fluid back to the pasteurizer. Howthe Bourdon spring 22 is provided with a suitable ever, when the system is adjusted to operate in take-oil bracket 24 which bracket ispivotally the pasteurizing range, the valve will divert the connected by a link 25 to the pivotally mounted milk or other liquid back to the pasteurizer unit pen arm 28. This pen arm at its free end is whenever the milk temperature drops below the provided with a stylus (not illustrated), which predetermined value. stylus cooperates with a clock driven chart 2'! to For a clearer understanding of the invention, draw on the chart, a graph corresponding to the reference is made to the description and claims temperature prevailing at the bulb 20. A second 40 when taken with the drawing in which the sinpen arm 28 has its upper or free and provided 40 gle view illustrates a pasteurizing system havwith a stylus (not shown) adapted to mark on ing incorporated therein a flow diversion valve, a the margin of the chart 2! to indicate a certain safety thermal limit controller and a controller condition of the flow diversion valve. This secfor maintaining the heating water at a given 0nd pen arm is mounted on the armature of a temperature, the flow diversion valve and the magnet 29, the operation 01' which will be iur- 45 controller being shown in front elevation parther described hereinafter.

tialiy in section. The free end of the Bourdon spring 23 is pro- The pasteurizing system generally may be simivided with a movable contact 30 which is lar to that disclosed in Fielder Patent No. mounted between two spaced, fixed contacts ll 1,859,504, granted May 24, 1932, while the flow and 32, as will be hereinaiter set iorth. .50 diversion valve herein illustrated may be similar The system also comprises a temperature conto that disclosed in the copending application of trolling device generally designated 0 for con- George Karst, Serial No. 269,437, filed April trolling the temperature of the heating water 1939. while circulating in the pipe 33 through the pas- It is unnecessary to describe the specific conteurizing unit 8. The controller further includes 55 temperature set-point adjusting mechanism in the form of an arm 35 which is pivoted at its upper end at 35. The lower end of this arm is provided with segment teeth adapted to mesh with teeth of an adjusting ear 31. Any suitable means such as a key, may be provided to rotate this gear either clockwise or counterclockwise to a position of adjustment. The arm 35 is 'tcnnected by a link 38 to an index 39 which. is movable over a suitable temperature scale generally indicated at 40. Thus by rotating the gear 31, the index 35 is moved over the scale to indicate the desired set point or controlling temperature. It will be understood that the controller mechanism operates by means (not shown) to maintain the heating water in the pasteurizer unit 3 at the desired or set-point temperature. It will be noted that the arm 35 is provided with a bracket 4|. This bracket when moved into the position shown, closes a single pole switch generally designated 42.

It is believed that the invention will best be understood by describing the operation of the system when it is functioning to control the pasteurization of milk. During pasteurization the index of the controller C is set at 160 1?. so that the bracket 4i on the set point adjustment opensthe contacts of switch 42. As long as the milk is being discharged from the pasteurizer into the inlet of the flow diversion valve, at the prescribed temperature, namely, at 160 F., the thermosensitive fluid in the bulb 20 of thetube system will expand, causing both of the Bourdon springs 22 and 23 to unwind. The unwinding of the Bourdon spring 22 moves the pen arm 26 to a position in which it records on the chart 21 the temperature prevailing at the bulb 20. When the I Bourdon spring 23 unwinds, it brings the movable contact 30 carried thereby into engagement with the fixed contact 32. As a result of the clo sure of these contacts a circuit is completed from the power conductor 43, conductor 44, winding of the relay 45, conductor 46, movable contact 34,

fixed contact 32, conductor 41, resistor 43, conductor 43 to the power conductor 50. Under the control of this circuit, the relay 45 is energized and thereby closes a locking circuit for itself from the power conductor 43, conductor 44, winding of the relay 45, conductor 5i, armature 52, and its related normally open contacts 53, resistor 43, conductor 49 and power conductor 50. Thus the relay 45 has a locking circuit completed for itself which circuit is independent of its original energizing circuit.

With the relay 45 operated, an energizing circuit is completed for the relay 54. This circuit extz-nds from the power lead 43, conductor 44, armature and its normally open contact, conductors 53 and 51, winding of the relay 54, conductors 53 and 49, the power conductor 50. With the relay 54 operated, a circuit is completed from the power lead 50, conductor 55, through magnet o! the electrically-operated valve 60, conductor 5i, front contact and armature 52 of-the relay conductors 53 and 44, to the power conductor valve 50 is energized to open the valve 54 so that compressed air is supplied to. the motor top i5 of the flow diversion valve. This motor opens the valve 5 so that milk can flow therethrough from the inlet port 6 to the outlet port l2 thereof.

Also with the relay 54 operated, a circuit is also completed for operating the motor control relay 65. This circuit is traceable from the power lead 54, conductor 55, contacts of the manually The winding of the electrically operated.

operated switch 61, winding of the relay 85, conductor 68, armature 69 and front contact of relay 54, conductors I0 and 44, to the power conductor 43. The relay 65 when energized in this manner attracts its armature to close an energizing circuit for the motor H which circuit includes the conductors l2 and I3 and the power leads 43 and 50. The motor II operates to drive a Dump (not shown) which, in turn, forces the milk through the pasteurizer and through the flow diversion valve which, under the condition assumed, is in its open position permitting the milk to flow through its outlet port i2.

If the milk discharged from the pasteurizer is below the prescribed temperature, the thermosensitlve medium in the bulb 20 will contract. This permits the Bourdon springs 22 and 23 to wind up. As the Bourdon spring 22 winds up, the pen arm 26 records the lower temperature, on the chart 21. When the second Bourdon spring 23 winds up, the movable contact 30 carried thereby, engages the fixed contact 3|. When this takes place, a circuit is completed from the power lead 43, conductor 44, fixed contact 3|, movable contact 30, conductors 46 and Bi, armature 52 and its normally open contacts 53, resistor 48, conductor 49, to the power conductor 50. This circuit shunts the winding of the relay 45 so that this relay deenergizes to retract its armatures and thereby open the previously described locking circuit for itself. As soon as the relay 45 releases its armatures, the energizing circuit of relay 54 is opened and this relay also retracts its armatures. When the relay 54 deenergizes, the winding of the electrically operated valve 64 deenergizes causing this valve to cut off the flow of compressed air to the motor l5 of the flow diversion valve 5. The spring (not shown) of the flow diversion valve moves the disks of this valve to a position for cutting oil the outlet port l2 of the valve and for connecting the inlet port 6 thereof to the flow diverting port 9 so that the improperly pasteurized milk is returned to the pasteurizer for further treatment. With the valve in its diverting position, the clip l8 which couples the valve stem with the valve stem extension, depresses the button ll of the switches to move the switch blade I6 to the position illustrated in dotted lines. Also when the relay 54 deenergizes it opens the original energizing circuit for the motor controlling relay 65. However, this relay is energized at this time in a circuit traceable from the power conductor 50, conductor 68, push button switch 61, winding of relay 65, conductor 68, armature 63 and back contact of relay 54, conductors 14 and 15 through the switch S, conductor 16 to the power conductor 43. completed, the motor drives the pump (not shown) which advances the milk through the diversion port 8.

However, at the close of the pasteurizing opera- -tion when it is desired to force cleaning liquid through the system, the set pointer or index 38 of the controller C is adjusted to a set-point or temperature well below the pasteurlzing range, for example, at a temperature below 120 F. In the absence of the present invention, the fiow diversion valve would move to the position herein disclosed, that is, to the position where it diverts the liquid through port 9. Thus it would not be possible for the cleaning liquid to how through the outlet port I2 of this valve and to the regenerator i4 or other apparatus connected thereto, However, in the present arrangement when With the circuit for the motor 1i still" iitl its discharge port the controller is adjusted to a set point temperature below 120 F., the bracket 4| closes the concontacts of switch 42, conductors 18 and 51, winding of the relay 54, conductors 58 and 49, to the power conductor 50. The relay 54 is energized in this circuit and closes a circuit which operates the electrically-operated valve 64. This valve then opens to supply compressed air to the motor top I5 01 the flow diversion valve which is thus maintained open. Also when the relay 54 is energized, the motor control relay 65 operates to close a circuit for the motor 1| as already described. This motor will thus operate the pump and force the cleaning liquid through the system.

It has been mentioned that a second pen arm 28 cooperates with chart 21 to indicate the adjustment of the flow diversion valve.' When this valve is positioned to permit milk to flow through I2, the clip I8 will be out of contact with the switch button I2. Switch S will moveits blade IE to theleft hand contact. This completes a circuit from power lead 43, conductor 16, switch S, conductor 18, winding of magnet 29, to the power lead 50. Magnet 28 is energized and moves the pen arm toward the tacts the switch blade I6 to the position illustrated. With the switch in this position, the magnet 29 has its energizing circuit interrupted. The magnet 29 retracts its armature thereby moving the pen arm away from signal lamp which is lighted being diverted.

I claim:

including an electric contact thermometer normally responsive to the temperature of the liquid introduced into said inlet port for opening said outlet port and for closing said diversion port when said liquid is at a given temperature and for reversing the condition of said last-mentioned ports when said liquid is below said given temperature, means including an adjustable controller for maintaining said liquid at said given temperature said controller being provided with an index for indicating the temperature to be maintained in said liquid, and means independent of said electric contact thermometer but responsive to an adjustment of said controller and its index to a temperature below said given temperature for maintaining said outlet port open and said diversion port closed irrespective of the temperature of the liquid introduced into said inlet port.

temperature for actuating said solenoid to, maintain said outlet port closed irrespective of the temperature of the liquid introduced into said inlet port.

4. In a pasteurizing system provided with a flow diversion valve, said valve having an inlet port for receiving a liquid, an outlet port and a diversion port, means including a relay for controlling the operation of said flow diversibn valve,

contacts, said changes in temperature of liquid introduced into said inlet port being movable into engagement with said fixed contacts respectively. an energizing circuit for said relay completed by the engagement of said movable contactand one of said fixed contacts, a locking circuit for said relay independent of said last-mentioned contacts and,

completed on energization of said relay, said movable contact and said other fixed contact when in engagement serving to shunt said relay, means including, an adjustable c ntroller for maintaining said liquid at a given temperature, and means independent of said electric contact respective of the temperature of the liquid introduced into said inlet port, said ,last-mentioned means including at'leasta part of said first-mentioned means.

. p L JosEPr vs. DETWRER. 

